What Is Slashing?
Also known as: Stake Slashing, Validator Slashing, Slashing Penalty
In short
Slashing is the penalty applied in Proof of Stake networks to validators that break the rules or behave in ways that could harm the network, in which the protocol cuts a portion of their staked assets.
In PoS systems, security rests on validators having something to lose, and slashing makes this deterrence concrete. On Ethereum, the main situations that lead to slashing are proposing two different blocks for the same slot and casting conflicting votes (attestations). Because these behaviors threaten the finality of the chain, the protocol detects them with proof, cuts the validator's stake and removes it from the validator set.
The amount slashed on Ethereum is not fixed. While a validator that errs alone receives a relatively small penalty, the penalty grows proportionally if many validators are slashed in the same period. This design makes coordinated attacks very expensive. Slashing differs from the small penalties offline validators receive for missed duties; simply being offline is generally not counted as slashing.
A significant share of slashing cases stems not from malicious intent but from operational errors. The most common example is running the same validator key on two separate machines at the same time for redundancy. Those who use liquid staking and restaking services also indirectly carry the slashing risk arising from operators' mistakes.
Last updated: · This content is for information purposes only and is not investment advice.